ACDelco 40009757 Nitrogen Oxide NOx Position Sensor Assembly GM OE Replacement

The ACDelco 40009757 is a Genuine OE Nitrogen Oxide (NOx) Position Sensor Assembly designed as a direct replacement for GM diesel vehicles. As an exhaust gas sensor, it continuously monitors the nitrogen oxide content present in the exhaust stream, feeding that data to the engine control module (ECM) to help maintain emissions compliance and optimal engine operation.

Key Features:

• OE-Grade Construction: Manufactured to meet or exceed General Motors' original equipment specifications for precise form, fit, and function
• Exhaust NOx Detection: Accurately measures nitrogen oxide concentration in diesel engine exhaust gases
• ECM Integration: Sensor data is used by the engine control module to adjust operating parameters and reduce harmful emissions output
• SCR System Compatible: Works in conjunction with selective catalytic reduction (SCR) systems to optimize AdBlue/DEF injection and minimize NOx emissions
• Direct Plug-In Replacement: Engineered to match original wiring harness connectors and mounting specifications — no modifications required
• Durable Design: Built to withstand high exhaust temperatures and the demanding underhood environment of diesel powertrains

Using a non-OE or incompatible NOx sensor can result in increased nitrogen oxide emissions, higher exhaust gas temperatures, misfires, or loss of engine power. The ACDelco 40009757 ensures the correct sensor type and wire length validated by GM engineers, protecting both performance and emissions compliance.